低碳铝镇静钢中(CaO)_x(Al₂O₃)_y及CaS的形成与控制

来源期刊：钢铁2009年第12期

论文作者：王敏 包燕平 刘建华 李太全 吴华杰 崔衡

文章页码：46 - 49

关键词：铝脱氧钢； 钙处理； 夹杂物

Key words：Al-killed steel； calcium treatment； inclusion

摘    要：生产低碳铝镇静钢过程中,为了控制夹杂物形态,一般要对其进行钙处理。如何使钙处理过程中生成液态的钙铝酸盐夹杂是生产控制的难点和重点。通过理论计算得出在一定条件下[Ca]-[Al]、[S]-[Al]关系图,以某低碳铝镇静钢为例,当w([Al])为0.03%时,控制w([Ca])为(9~15.8)×10^-6,可以生成成分接近(CaO)₁₂(Al₂O₃)₇的液相夹杂。钢中w([S])为30×10^-6,w([Al])为0.03%~0.04%,温度降低到1 723 K以下时,在(CaO)₁₂(Al₂O₃)₇上会析出CaS。

Abstract: Generally,in order to control the morphologies of inclusions,the low carbon Al-killed steel should be treated with calcium.It’s difficult and important to make the inclusions to be liquid(CaO)_x(Al₂O₃)_y inclusions though the processing control.Correlation figures between solute calcium and solute aluminum,also between solute sulfur and solute aluminum have been established theoretically.Taking a kind of low carbon Al-killed steel for example,when the solute aluminium is 0.03 percent and the calcium is controlled at(9-15.8)×10^-6,the liquid approximate(CaO)₁₂(Al₂O₃)₇ inclusions will produce in the molten steel.If the solute sulfur is blow 30×10^-6 and the solute aluminium is between 0.03 and 0.04 percent in the molten steel,when the temperature is below 1 723 K,the CaS will precipitate on the(CaO)₁₂(Al₂O₃)₇ surface.